For years people have been told to add stones or pebbles to the bottom of pots “for drainage”. The idea sounds logical, but plant roots and water movement are a little more complicated than that.

1. Pebbles do not stop soggy soil

Water does not instantly move from soil into the pebble layer below. Instead, moisture often stays sitting higher in the pot than expected.

• The soil above the stones can still remain wet.
• Roots may still sit in overly damp conditions.
• Drainage holes matter far more.

2. Good soil structure matters more

Healthy drainage usually comes from the soil mix itself — not from rocks hidden underneath it.

Chunkier mixes help improve airflow around roots and reduce heavy compaction over time.

3. Drainage holes are far more important

Even the best soil can struggle in a pot with no drainage. Excess water needs somewhere to escape, especially indoors where evaporation is slower.

• Use pots with drainage holes where possible.
• Do not let pots sit in excess water.
• Check the soil before watering again.

4. Some decorative pots can cause hidden problems

Decorative cache pots often trap water around nursery pots without people realising. Over time this can leave roots sitting in stagnant moisture.

• Empty excess water after watering.
• Lift nursery pots occasionally to check underneath.
• Do not rely on pebbles to solve poor drainage.

5. Healthy roots usually come down to balance

Plants generally prefer a balance of moisture, airflow and stability — not permanently soggy compost or bone-dry soil.

The simple truth

Pebbles are not harmful purely for decoration, but they are not a magical drainage fix. In most cases, better soil structure and proper drainage holes matter far more.